: It is engineered to handle up to 1700 Nm of torque, making it suitable for powerful engines in urban and long-distance transport [5.7, 5.9].
| Symptom | Possible cause | |---------|----------------| | Harsh 1-2 upshift | Worn converter lock-up clutch or solenoid valve. | | Retarder inactive | Low oil level, failed retarder valve, or TCU software fault. | | No reverse gear | Broken reverse clutch pack (less common) or shift actuator problem. | | Transmission overheating | Clogged oil cooler, low oil, or constant converter slip (faulty lock-up). | | CAN communication errors | Wiring harness chafing near bell housing (common ZF issue). | zf ecolife 6ap1700b